Switch



Sept 13, 1932- H. P.. CHANDLER SWITCH Filed Nov. 14, 1929 t lnvenlorUMEB @E ULEB A Harney Patented Sept. 13, 1932 UNITED STATES VPATENT,OFFICE l HOHER P. CHANDLER, OF MANSFIELD, OHIO, ASSIGNOR TO THE OHIOBRASS COMPANY,

OF MANSFIELD, OHIO, A CORPORATION F NEW JERSEY SWITCH Application ledNovember 14, 1929. Serial No. 407,114.

My invention relates to quick break type of operative switches foropening and closing electric circuits.

The object of my invention is to provide a switch which will not onlymake a quick break but a quick make in which a magnetic blowout isemployed which is in circuit only for a short interval of time when thecircuit is being broken or made although the blow-out performs no usefulfunction at the time of closing the switch.

My invention resides in the new and novel construction, combination andrelation of the parts described in this specification and shown in thedrawing attached thereto.

In the drawing Fig. 1 is a plan view in elevation of my invention with aportion of the corner and arc shute broken away as later described.

Fig. 2 is a View in section of Fig. 1 taken on the line 2 2 of Fig. 1.

Fig. 3 is a viewin section of Fig. 1 taken on the line 3-3.

In the preferred embodiment of my invention I employ two oppositelydisposed insulating panels 1 and 2 and represent the back and frontrespectively of the switch. The members are shown as approaching atriangular shape although other shapes may be employed if desired, butwith the shape shown the space taken up by the switch is reduced to thatonly necessary and also there is a saving in material. The members 1 and2 may be made of fiber, hard rubber, any resin compounds, slate, etc.

The members are held in spaced relation by means of the spacing members3 which also form the sides of the switch-box and are secured inpositionby means of the through bolts and nuts 4 and also by the cornermember 5 formed of metal. The spacer member 6 and bolt and nuts 7therefore also tend to hold the members 1 and 2 in spaced relation. Thecorner member has a receptacle portion 45 8 in which the ends of themembers 1, 2 and 3 are inserted and held in position by the bolts andnuts 9. A projection 10 with a hole 11 therethrough provides means forholding the switch in position upon a support. The

5 lugs 12 are also for this purpose.

Secured to the side member 3 is a main contact member 13 and auxiliarycontact member 14, vheld in place by the screws 15 and 16 respectivelyand the members 13 and 14 are spaced apart, but connected through a coil17. The main contact 13 has a connecting lug 18 secured thereto andprojecting from the casing for the attachment of a conductor.

Mounted upon the member 2 is a switch blade 19 arranged to pivot to anopened posi- 00 tion and a closed position with respect to the contacts13 and 14 and is iXedly secured to a stud 2O which in turn is secured toan insulating bushing 2-1 by means of a threaded connection and pin 22.The bushing 21 also has 65 lixedly secured to it a stud 23 by means ofthreads and pin 24 and integrally united to the stud 23 is an arm 25. Itwill be noted that the blade 19 and the arm 25 are thus secured togetherin fixed relation and rotatable together and they are mounted in themember 2 through the medium Vof the flanged metal bushing 26. The blade19 when in the partially closed position connects the contacts 13 and 14and short circuits the coil 17 so that in effect no current Hows throughthe coil 17 and when the switch is in its fully closed positionengagement is with contact 13 only.

Secured to the side member 3 is also a pivot contact member 27 by meansof screws 28. The member 27 is provided with two spaced blades 29between which is positioned the blade 19 thus conducting current to oraway from the blade. Attached to the contact 27 by means of the screws28 is a conductor 30 to the exposed end of which is a socket 31 toreceive a conductor. The contacts 13 and 14 are provided with spacedclips 32 and 33 respectively. The clips 33 are so formed that they donot contact with the blade when the switch is. fully closed. (See Fig.2).

Positioned on opposite sides 0f the contacts 13 and 14 and spacedtherefrom are insulating members 34 which form as it were an arc shutefor the purpose of conducting such arc upwardly as ma be formed when theswitch is opened an maintaining the arc out of contact with the otherparts of the switch. The members 34 may be made of an |00 insulatingmaterial much more resistant to burning than the members l and 2 asthese latter members are preferably formed of a material which hashigher insulating value than the members 34, but of a lower charringvalue.

I In order to cause the arc to dissipate quickly in place of beingdragged out and following the movement of the switch blade, I employ amagnetic blow-out consisting of two side members 35 and 36 respectivelyand connecting member 37 formed preferably of soft sheet iron thusforming the core of a U shaped magnet with the free ends or poles ad'jacent the point where the blade leaves the contacts 33, but separatedtherefrom by the insulating members 34. Upon the leg 35 is positionedtheA coil 1T having its ends connected to contacts 13 and 14respectively.

The coil 17 will be energized only when the blade I9 is in contact withthe clips 33 and as this is only for a short interval of time during theopening or closing of the switch, I am able to reduce the size of thecoil 17 materially as I can use a wire of relatively small diameter asthe current will not pass there' through for a suiiicient length of timeto cause dangerous heating thereof. If the coil Were in series andenergized by the entire current flowing through the switch for theentire time the switch was closed, it would be necessary to use a wireof such size as to carry the maximum current which the switch wouldcarry and for the entire time it was closed which might be for manyhours. Vith the arrangement I have shown it is possible to use arelatively small blow-out mechanism thus permitting me to reducematerially the size of the switch and also the cost of the same.

It will be recognized that the same results will be secured if the blademade Contact with the clips 32 and 33 while the switch is fully closedbut in that case the frictional resistance to opening and closing willbe greater than described above.

In order to operate the switch to its open and closed position Ipivotally mount upon the exterior of the member 2 a handle. mechanism 33by means of the bolt and nut 39. The handle mechanism is formed with areceptacle like portion 40 and an insulating handle 4l and mountedwithin the receptacle 40 is the end of the arm 25. The arm 25 isprovided with a lug 42 and secured to lug 42 and the handle mechanism 40is a spring 43. It will be noted that when the handle shown in Fig. l ismoved clockwise that the spring will be placed under increased tensionuntil the longitudinal axis of the spring is in alinement with the stud42 and the axis of rotation of the arm 25 and up to this point thetendency will be for the spring to hold the arm 25 in the position shownin Fig. 1, but as soon as the handle is moved farther in a clockwisedirection the tendency then will be for the spring to rotate the armabout its axis of rotation and with sufficient tension in the spring 43and sutiicient movement in a clockwise direction of thc handle 4l, thefriction holding the blade in engagement with the clips 32 will beovercome and the blade 19 will move toward its open position understrong tension in the spring 43.

Should there be a tendency for the blade to resist movement, I haveprovided on the in*` side of the member 40 ribs 44 which will engagewith the arm 25 after the handle has moved a predetermined amount andthereby force the blade to a released position and the spring 43 willthen throw it to its fully open As soon as the blade 19 disengages fromthe clips 32 and contact with the clips 33, current will instantly fiowthrough the coil 17 thus energizing the magnetic blow-out and operatingto extinguish the arc formed be tween the blade 19 and the contacts 33.

It will be noted that the operating mechanism for the switch, which isvery simple in itself, is located entirely without the casing proper.

Having described my invention, I claim A switch mechanism comprising aswitch blade operable to either an open or a closed position, a housingtherefor, an operating shaft for the switch member pivotally mounted onone of the walls of the housing and having two metallic membersconnected in xed insulated relation by an insulating collar and allthree parts rotatable in unison, one metallic member fixed to the switchmem-ber and the other metallic member having a crank arm extensionoutside t-he housing, a handle having a. hand grip at one end and areceptacle at the other end pivoted to the housing, the pivotal pointsof the shaft and handle being spaced apart and the receptacle portionenclosing the free end of the crank arm and an overcenter springconnected to the free end of the crank arm and to the handleintermediate its end to pivot the shaft with a snap action in eitherdirection tomove the switchl blade to either its open or closedposition.

In testimony whereof I aiiix my signature.

HOMER P. CHANDLER.

